This is the 7205th most frequent Catalan word.
alga
"Alga" in Catalan means "alga" or "seaweed" in English.
The word 'alga' here is singular and used to refer to seaweed in a scientific context.
Estem estudiant la biologia de l'alga.
We are studying the biology of the seaweed.
Here, 'algues' is the plural form of 'alga' used as a noun to denote seaweeds.
Les algues marines són un aliment nutritiu.
Seaweeds are a nutritious food.
In this sentence, 'alga' is singular and used as a noun referring to a specific seaweed.